Apparatus for casting ingots in continuous long lengths.



`FatBWlBd July 29, |902. J. O. E. TROTZ.

APPARATUS FOR CASTING INGOTS IN CONTINUOUS LONG LENGTHS.

(Application tiled Apr. 28, 190.0.) (No Model.)

HH IIIIII-l IIIII UNITED STATES "PATENT OFFICE.

JOI-IAN OTTO EMANUEL TROTZ, OF WORCESTER, MASSACHUSETTS.

APPARATUS FOR CASTINGINGOTS` lN CONTINUOUS LONG LENGTHS.

SPECIFICATION forming para of Letters Patent Nb. 7o5,721, dated July 29,' 1902. `Application iiled April 28, 1900. Serial No. 14,708` (No model.)

To all whom, it 11i/cry concern.'

Be it known that I, JOHAN OTTO EMANUEL TROTZ, of the city andvcounty of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Apparatus for Casting Ingots in Continuous Long Lengths; and'I do hereby declare that,

the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, forming a part of this specification, and in which-f Figure 1 represents a side view,partly in section, of so much of an apparatus for casting ingots in continuous long lengths as is necessary to illustrate my improvements, and Fig. 2, represents upon an enlarged scale, a vertical central section through the part of said apparatus to which said improvements relate.

The object of this invention is to cover certain improvements not'embodiedin myformer application for United States Letters Patent for a similar apparatus, filed December 17, 1898, bearing Serial No. 699,525, allowed October 9, 1899, and which was issued April 24, 1900, as Patent No. 648,091.

To enable others skilled in the art to which i my said invention appertains to betterunderstand the nature and purpose thereof, I will now proceed to describe it more in detail.

In the drawings,A represents the outer case or jacket,which is provided with the hollow heads B and C,'having the annular waterchambers B C', respectively. Within said jacket and heads are centrally and longitudinally arranged the ingot-mold D, which fits in central openings in said heads and has an annular chamber E surrounding the same between it and the jacket A. Said jacket is fastened at ornear its ends to the heads B O, in this instance by providing a portion of the exterior of each end thereof with threads and securing said ends into threaded openings in the heads, as is shown in Fig. 2 of the drawings. Any other method of fastening, hoW- ever, maybe adopted, if desired.

In order to obtain a free circulation between the chambers B C in heads B C and the annular chamber E around theingot-mold, the jacket A is made a little shorter than the distance between the inside of the outer end walls of the heads, so as, to leave an opening F at each end, as is also shown in Fig. 2. The

charged at the top through the pipe H but,

if preferred,the direction f said iiow of water may be reversed. By thus maintaining a uniform How of` water orother cooling medium around the ingot-mold it is obvious that the molten metal passed through it may be cooled uniformly on all sides.

The essential features of my invention consist, as before stated, in constructing the apparatus so that the ingot-mold may freely expand longitudinally andin elongating the funnel lI, into which 'the molten metal is poured,.so that it will extend a considerable distance into'said ingotunold and the molten metal. Said longitudinal expansion of the ingot-Inold may be accomplished in various Ways. I preferin practice, however, to effect said result by fitting the lower end of said ingot-mold loose in the bottom head C of jacket A, so that it may freely slide longitudinally therein to allow of said longitudinal expansion. The joint between the two parts may be made practically water-tight, while also admitting of said longitudinal slide motion, by using a suitable elastic packing J,

fastened in the head and bearing against the surface of the mold, as is shown in Fig. 2.

Either the top or bottom end of the ingotmold may be constructed to slide in its respe'ctive head, as aforesaid, or, if preferred, both ends may be fastened rigid to the heads and the longitudinal expansion thereof obtained by constructing the jacket so that it may be elongated by said expansion of the ingot-mold. This maybe done by making kthe jacket in two or more longitudinal sections, one overlapping the other, as is shown at K in Fig. 2, with a tight closefitting joint between said overlapping ends, adapted to prevent the Water from escaping at said point and also admitting of longitudinal motion IOO one against the other to conform to the expansion ofthe ingot-mold. If desired, a packing L may be used to prevent said escape of water, said packing being held in place by suitable means, as in the previ ously-described instance, for making the slide-joint at the end of the ingot-mold water-tight. This feature of allowing for the longitudinal expansion of said ingot-Inold is an important one in practice, for the reason that if such expansion or elongation of the mold is not provided for it will be caused to bend laterally or buckle between the two fastened ends by the expansion produced in pouring the molten metal therein, thereby preventing the metal from being readily drawn from the mold, and in consequence forming imperfect ingots. It is not only important that the ingot-mold be prevented from buckling, as aforesaid, but also that the interior thereof shall be worked and polished to a perfectly straight and smooth surface, as described in my former application hereinbefore referred to, in order that the metal may readily pass down and be easily drawn from said mold as fast as it is cooled at the bottom to the proper degree of hardness to sustain itself and retain its shape.

The process of cooling and continuously drawing the metal from the mold is fully described in my said former application, and it will therefore be unnecessary to enter into a detailed description thereof in the present case.

In Fig. l of the drawings I have shown.

the metal as being drawn from the mold by means of a hydraulic piston M (only the upper end of which is shown) and a piston-rod N, whose head O serves as a support for the metal until the bottom portion thereof has become sufficiently hardened to retain its shape, as aforesaid. Having become thus hardened by the cooling medium around the mold to the proper degree to be drawn forward, it is drawn down between the rst two rolls P, which then feed it forward continuously as long as the metal is poured into the mold. y

The method of pouring the molten metal from a funnel whose lower` end comes a considerable distance above the mold is objectionable on account of spattering said metal onto the sidesof the mold, to which it adheres and causes an uneven body of metal to be formed at the top,'liable to contain blowf holes and pipes, and to obviate thisiobjection what is known as bottomcasting or pouring the molten metal in at the bottom, so that it will flow up and fill the mold, is adopted.

I find that by elongating the funnel I so that its nozzle I' may extend down into the mold and molten metal, as is shown in Fig. 2, I am enabled to accomplish substantially the same result as by bottom casting and by a method which is applicable to myimproved process of forming the ingots and drawing them down from the mold continuously, as is fully described in my former application and partially described in the foregoing description. By thus using a funnel extending down into the molten metal,which is poured in as fast as it is drawn from the bottom,I do awaylwith all spattering, and the upper end of the metal bath is kept of as uniform texture as the rest of the body of the metal which has been previously poured. While the construction employed in effecting this result is very simple, it is of the utmost importance in practice, inasmuch as I am thereby enabled to produce ingots of uniform quality free from blow-holes and pipes. It will at once be apparent that by thus extending the nozzle of the funnel down into the body of the metal being poured it is impossible to cause any spattering thereof, for the reason that suflicient metal is constantly supplied to maintain about the level shown in Fig. 2 and keep the nozzle buried beneath the surface of the molten metal.

Having now described my invention, what I claim therein as new, and desire to secure by Letters Patent, is-

l. The combination of jacket A, and hollow heads B, C, the latter fastened to the ends of said jackets and having supply and discharge pipes, also having separate openings to receive and hold the ends of the ingotmold D, with said ingot-lnold, the latter held rigid at the upper end in head B, tted loose at its lower end in head C, and whose inner surface is polished straight and smooth, and the funnel I, said funnel having the downward extension I into the ingot-mold, and fastened to head B, substantially as and for the purpose set forth.

2. The jacket A and hollow heads B, C, the latter fastened to the ends of said jacket and having supply and discharge pipes, also having separate openings to receive and hold the ends of the ingot-mold D, the latter being held rigid in the upper end in head B, fitted loose at its lower end in head C, and whose inner surface is polished straight and smooth, and the funnel I, said funnel having the downward extension I into the ingot-mold, and fastened to head B, in combination with means for supporting the molten metal in the ingot-mold until properly cooled to draw, for conducting it to the rolls of the rolling-mill, and said rolls; said means for supporting and conducting the metal comprising the vertically-operating piston M, connecting-rod N and head O, substantially as and for the purpose set forth.

' JOHAN OTTO EMANUEL 'lRO'lZ- Witnesses:

A. A. BARKER, W. B. NoURsn.

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